{
  "id": "rust/e0277-trait-bound-not-satisfied-for-closure",
  "signature": "error[E0277]: the trait bound `[closure@...]: MyTrait` is not satisfied",
  "signature_zh": "错误[E0277]：闭包未实现特征`MyTrait`",
  "regex": "error\\[E0277\\]: the trait bound `\\[closure@[^\\]]+\\]: .+` is not satisfied",
  "domain": "rust",
  "category": "type_error",
  "subcategory": null,
  "root_cause": "A closure or function passed to a generic function does not satisfy the required trait bound, often because the closure captures variables that don't implement the trait.",
  "root_cause_type": "generic",
  "root_cause_zh": "传递给泛型函数的闭包或函数不满足所需的特征约束，通常是因为闭包捕获了未实现该特征的变量。",
  "versions": [
    {
      "version": "rustc 1.70.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "rustc 1.75.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "rustc 1.80.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Type annotations don't change the trait implementation; the closure still lacks the required trait.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Rc<dyn MyTrait> or Box<dyn MyTrait> won't work if the closure doesn't implement MyTrait; you need to actually implement the trait.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "`impl Trait` in closure parameters is not allowed; it only works in function return types.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Refactor the closure to explicitly implement the required trait, e.g., by moving the logic into a named struct that implements MyTrait.",
      "success_rate": 0.85,
      "how": "Refactor the closure to explicitly implement the required trait, e.g., by moving the logic into a named struct that implements MyTrait.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Change the generic function to accept a boxed trait object: `fn foo(f: Box<dyn MyTrait>)` and pass `Box::new(closure)`.",
      "success_rate": 0.75,
      "how": "Change the generic function to accept a boxed trait object: `fn foo(f: Box<dyn MyTrait>)` and pass `Box::new(closure)`.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "将闭包逻辑重构为显式实现特征的结构体，例如创建一个命名结构体来实现MyTrait。",
    "修改泛型函数以接受特征对象：`fn foo(f: Box<dyn MyTrait>)`，然后传递`Box::new(closure)`。"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://doc.rust-lang.org/error_codes/E0277.html",
  "official_doc_section": null,
  "error_code": "E0277",
  "verification_tier": "ai_generated",
  "confidence": 0.85,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2023-06-15",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}